fix: idle_timeout filed to support set zero value

[zaunist]

Please answer these questions before submitting a pull request, or your PR will get closed.

Why submit this pull request?

A struct filed will be omit which have omitempty tag and be set to default value, so we should use pointer to avoid this problem.

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What changes will this PR take into?

Please update this section with detailed description.

Related issues

fix/resolve #2294

Checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[codecov-commenter]

Codecov Report

Merging #2296 (7c00f49) into master (88dadc2) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2296      +/-   ##
==========================================
+ Coverage   69.80%   69.83%   +0.02%     
==========================================
  Files         184      184              
  Lines        7280     7280              
  Branches      830      830              
==========================================
+ Hits         5082     5084       +2     
+ Misses       1902     1900       -2     
  Partials      296      296              

Flag	Coverage Δ
backend-e2e-test	37.14% <ø> (ø)
backend-e2e-test-ginkgo	59.42% <ø> (+0.07%)	⬆️
backend-unit-test	49.22% <ø> (ø)
frontend-e2e-test	68.16% <ø> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
api/internal/core/entity/entity.go	90.90% <ø> (ø)
web/src/helpers.tsx	73.77% <0.00%> (+3.27%)	⬆️

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[starsz]

Can you add test to cover it ?

[zaunist]

Can you add test to cover it ?

Do it latter.

[zaunist]

cc @nic-chen